6 Principles of Operation
To further protect the output stages, the pat- ented ODEP circuitry is used. It produces an analog output proportional to the always changing die temperature of the output transis- tor. This output controls the translator stage previously mentioned, removing any further drive that may exceed the safe operating area of the output stage.
Thermal sensors S100 and S200 give the ODEP circuits vital information on the operat- ing temperature of the heat sink on which the output devices are mounted.
Should the amplifier fail in a way that would cause DC across the output lead, the DC pro- tection circuit senses this on the negative feed- back loop and shuts down the output stage drive until the DC is removed.
6.2.2 Bridge-Mono Operation
By setting the back panel stereo/mono switch to
The channel 1 output feeds the channel 2 error amp
opposite polarity of channel 1. This makes it possible to deliver twice as much voltage to the load while the protection mechanisms for each channel continue to work independently.
6.2.3 Parallel-Mono Operation
With the stereo/mono switch set to Parallel- Mono, the output of channel 2 is paralleled with that of channel 1. A suitable jumper capable of handling high current must be connected across the positive (+) output terminals to gain the benefits of this operating mode.
The signal path for channel 1 is the same as previously discussed, except that channel 1 also drives the output stage of channel 2. The balanced input, error amp, translators, and LVAs of channel 2 are disconnected and no longer control the channel 2 output stage. The channel 2 output stage and protection mecha- nisms are also coupled through S1 and func- tion as one.
In
Operation Manual | page 17 |